This Quantum Data 780 handheld test instrument for HDMI is a great tool. Note that it does not come with a power supply.

To use this Quantum Data 780 handheld test instrument for HDMI, first make sure you have a suitable power supply as it's not included. Connect the instrument to the HDMI device you want to test. Then start the testing process. When using it, avoid exposing it to extreme temperatures or humidity. After use, store it in a dry and cool place. Also, keep it clean and don't let dust accumulate on it.